Force and Motion

A 1,100 kg car comes uniformly to a stop. If the vehicle is accelerating at2 1.2 m/s, which force is closest to the net force acting on the vehicle?

• -9,600 N

• -1,300 N

• -900 N

• -94 N

Tags

NGSS.MS-PS2-2

The picture shows an aerialist walking on a tightrope and holding a balancing bar.

An action–reaction pair of forces exists between —

• the aerialist’s feet and the rope

• the rope and the balancing bar

• the two ends of the rope

• the aerialist’s arms and legs

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-5

A marble is given potential energy by being placed at Location W. When the marble is released, it rolls down the track.

At which location does the marble have maximum kinetic energy?

• Location W

• Location X

• Location Y

• Location Z

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

NGSS.MS-PS3-4

Four boxes are sliding with constant speed before each box experiences an unbalanced force of 8 N. Which box would experience the greatest acceleration when the unbalanced force is applied?

• The box with a mass of 2 kg

• The box with a mass of 4 kg

• The box with a mass of 6 kg

• The box with a mass of 8 kg

Tags

NGSS.MS-PS2-2

A block is pulled 0.90 m to the right in 2.5 s.

What is the block’s average speed to the nearest hundredth of a m/s?

• 36 m/s

• 0.36 m/s

• 0.036 m/s

• 036 m/s

Tags

NGSS.MS-PS3-1

A physics teacher performed a demonstration for a science class by pulling a crate across the floor and measuring the force with a spring scale. While she pulled, a student measured the acceleration of the crate with a handheld electronic device. The results of three trials are shown below.

The teacher asked the class to calculate the acceleration of the crate based on the crate’s mass and the force she applied. What conclusion can be made about the difference between the calculated acceleration and the actual acceleration that occurred in the trials?

• Another force in the direction of the motion produced a lower acceleration than calculated.

• An opposing force caused by friction produced a lower acceleration than calculated.

• Another force in the direction of the motion produced a higher acceleration than calculated.

• An opposing force caused by friction produced a higher acceleration than calculated.

Tags

NGSS.MS-PS2-2

Students slid a small wood block along a flat tabletop for a distance of 1.6 m. The data show the motion of the block of wood.

Which graph displays the motion of the wood block?

• 
• 
• 
• 

Tags

NGSS.MS-PS3-1

The unusual strength of a glue makes it able to hold a heavy object, or load, as shown in the diagram below.

If the load exerts a strong downward force, the glue —

• destroys the force

• exerts a stronger downward force

• causes the load to accelerate upward

• exerts an upward force that is equal to the downward force

Tags

NGSS.MS-PS2-1

A meteor moving 468 km per minute traveling in a south-to-north direction passed near Earth in 2013. Because the meteor was only 45 m wide and was 27,700 km above Earth’s surface, it was not visible without the aid of a telescope.

Which statement describes the meteor’s motion?

• Its velocity was 7.8 km/s northward.

• Its acceleration was 468 km/s2.

• Its speed was 468 km/s northward.

• Its acceleration was 7.8 km/s2.

Two forces are applied to a 17

kg box, as shown. The box is on a smooth surface.

Which statement best describes the acceleration of the box?

• The box accelerates at 1.0 m/s2 to the right because the net force is 17 N to the right.

• The box accelerates at 1.9 m/s2 to the right because the greater force is to the right.

• The box accelerates at 3.0 m/s2 because the combined forces cause the box to accelerate.

• The box does not accelerate, because neither force is large enough to move the box.

Tags

NGSS.MS-PS2-2